Hi Tony, I love your patch! Yet something to improve: [auto build test ERROR on s390/features] [also build test ERROR on linus/master v5.10-rc2 next-20201103] [cannot apply to kvms390/next linux/master] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Tony-Krowiak/s390-vfio-ap-dynami... base: https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git features config: s390-allmodconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/32786ef6d4ba3703d993a8894ea1d7637... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Tony-Krowiak/s390-vfio-ap-dynamic-configuration-support/20201023-011543 git checkout 32786ef6d4ba3703d993a8894ea1d763785fd3a4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/s390/crypto/vfio_ap_ops.c:1316:5: warning: no previous prototype for 'vfio_ap_mdev_reset_queue' [-Wmissing-prototypes] 1316 | int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi, | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/s390/crypto/vfio_ap_ops.c:1568:6: warning: no previous prototype for 'vfio_ap_mdev_hot_unplug_queue' [-Wmissing-prototypes] 1568 | void vfio_ap_mdev_hot_unplug_queue(struct vfio_ap_queue *q) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/s390/crypto/vfio_ap_ops.c: In function 'vfio_ap_mdev_on_cfg_remove': drivers/s390/crypto/vfio_ap_ops.c:1777:7: warning: variable 'unassigned' set but not used [-Wunused-but-set-variable] 1777 | bool unassigned = false; | ^~~~~~~~~~ drivers/s390/crypto/vfio_ap_ops.c: At top level: drivers/s390/crypto/vfio_ap_ops.c:1813:6: warning: no previous prototype for 'vfio_ap_mdev_on_cfg_add' [-Wmissing-prototypes] 1813 | void vfio_ap_mdev_on_cfg_add(void) | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/s390/crypto/vfio_ap_ops.c:11: In function 'memcpy', inlined from 'vfio_ap_mdev_unassign_apids' at drivers/s390/crypto/vfio_ap_ops.c:1655:3, inlined from 'vfio_ap_mdev_on_cfg_remove' at drivers/s390/crypto/vfio_ap_ops.c:1800:8, inlined from 'vfio_ap_on_cfg_changed' at drivers/s390/crypto/vfio_ap_ops.c:1836:2: >> include/linux/string.h:402:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter 402 | __read_overflow2(); | ^~~~~~~~~~~~~~~~~~ vim +/__read_overflow2 +402 include/linux/string.h 6974f0c4555e285 Daniel Micay 2017-07-12 393 6974f0c4555e285 Daniel Micay 2017-07-12 394 __FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size) 6974f0c4555e285 Daniel Micay 2017-07-12 395 { 6974f0c4555e285 Daniel Micay 2017-07-12 396 size_t p_size = __builtin_object_size(p, 0); 6974f0c4555e285 Daniel Micay 2017-07-12 397 size_t q_size = __builtin_object_size(q, 0); 6974f0c4555e285 Daniel Micay 2017-07-12 398 if (__builtin_constant_p(size)) { 6974f0c4555e285 Daniel Micay 2017-07-12 399 if (p_size < size) 6974f0c4555e285 Daniel Micay 2017-07-12 400 __write_overflow(); 6974f0c4555e285 Daniel Micay 2017-07-12 401 if (q_size < size) 6974f0c4555e285 Daniel Micay 2017-07-12 @402 __read_overflow2(); 6974f0c4555e285 Daniel Micay 2017-07-12 403 } 6974f0c4555e285 Daniel Micay 2017-07-12 404 if (p_size < size || q_size < size) 6974f0c4555e285 Daniel Micay 2017-07-12 405 fortify_panic(__func__); 47227d27e2fcb01 Daniel Axtens 2020-06-03 406 return __underlying_memcpy(p, q, size); 6974f0c4555e285 Daniel Micay 2017-07-12 407 } 6974f0c4555e285 Daniel Micay 2017-07-12 408 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org